If the numbers 1 to 10 are all multiplied together, how many zeros are at the end of the answer?
The numbers 72, 8, 24, 10, 5, 45, 36, 15 are grouped in pairs so that each pair has the same product. Which number is paired with 10?
The following sequence continues indefinitely... Which of these integers is a multiple of 81?
If $n$ is a positive integer, how many different values for the remainder are obtained when $n^2$ is divided by $n+4$?
How many pairs of numbers of the form x, 2x+1 are there in which both numbers are prime numbers less than 100?
Our school dinners offer the same choice each day, and each day I try a new option. How long will it be before I eat the same meal again?
How many of the numbers 1 to 20 are not the sum of two primes?
How many zeros does 50! have at the end?
At a cinema a child's ticket costs £$4.20$ and an adult's ticket costs £$7.70$. How much did is cost this group of adults and children to see a film?
Flora has roses in three colours. What is the greatest number of identical bunches she can make, using all the flowers?
Can you find three primes such that their product is exactly five times their sum? Do you think you have found all possibilities?
Using the hcf and lcf of the numerators, can you deduce which of these fractions are square numbers?
Can you form this 2010-digit number...
Find out which two distinct primes less than $7$ will give the largest highest common factor of these two expressions.
Tina has chosen a number and has noticed something about its factors. What number could she have chosen? Are there multiple possibilities?
Two numbers can be placed adjacent if one of them divides the other. Using only $1,...,10$, can you write the longest such list?
Roo wants to puts stickers on the cuboid he has made from little cubes. Will he have any stickers left over?
Will this product give a perfect square?
Each time a class lines up in different sized groups, a different number of people are left over. How large can the class be?